We wish to obtain an erect image of an object, using a concave mirror of focal length 15 cm. What should be the range of distance of the object from the mirror? What is the nature of the image? Is the image larger or smaller than the object? Draw a ray diagram to show the image formation in this case.

The object should be placed between the focus F and the pole P of the concave mirror, i.e., between 0 and 15 cm from the mirror. Then the image will be virtual, erect and larger than the object.

Fig. Image formed by a concave mirror with the object between F and P

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Which of the following lenses would you prefer to use while reading small letters found in a dictionary?

A convex lens of focal length 50 cm
A concave lens of focal length 50 cm
A convex lens of focal length 5 cm
A concave lens of focal length 5 cm

One-half of a convex lens is covered with a black paper. Will this lens produce a complete image of the object? Verify your answer experimentally. Explain your observations.

An object 5 cm in length is held 25 cm away from a converging lens of focal length 10 cm. Draw the ray diagram and find the position, size and the nature of the image formed.

Name the type of mirror used in the following situations:
(a) Headlights of a car.
(b) Side /rear-view mirror of a vehicle
(c) Solar furnace.
Support your answer with reason.

Light - Reflection and Refraction